The present invention relates to a method for measuring the connecting time of a terminal to a site in a communication environment comprising the terminal, site, and a server. When broadcasting signals through a plurality of information channels with an OFDM system, the plurality of information channels are multiplexed in the sense of frequency and collectively subjected to IFFT modulation for connected transmission instead of subjecting the plurality of information channels independently to OFDM modulation for transmission. An intelligent switch detects signals destined for an internet service provider and routes those signals on a separate path to the internet service provider. The computer system receives and stores the recorded call information and graphically displays the call information. In one embodiment the light generators emit complementary colors that mix to form white light.